Car is off the road at the moment as it has a few problems one of which is a blown exhaust manifold to turbo gasket. While replacing this I am going to replace the head to manifold gasket and have been looking at multi layered gaskets. Will there be any real advantage getting a seven layered one over a three layered one? Performance wise I am only looking to get it up to around 320 bhp (well I say that now).I've also decieded to get a stainless elbow and down pipe and am getting one made up by AM Performance. Do the standard gaskets fit this system? And if so does anyone know where I can get them for a reasonable price?